I really think that you should look at the headset as a long-term investment.
There are, of course, two main types: Passive and Active noise reduction...
My recommendation would be going toward Active NR. Reducing those low freq db's will really clear up the clarity of comms, and also save your ears for several years.
The downside of Noise Reduction is that in most cases, breaking the seal with temples from eyeglasses does reduce the active noise reduction.
I have been using David Clark X11's throughout my training. They are amazing for 1) not even knowing I am wearing them.... and that is for quite a few 8+ hour days. 2) DC designs their headsets to mil-spec. that means you can throw them on the ground, slam them in the door, smash the wires, etc.... and they will not be hurt. If they are hurt then the warranty is infallible.
Downside of the X11's is that since they are so "light" on the head, you cannot (note - cannot) wear sunglass temples underneath them. But seriously, I am more than happy that I made the decision to buy them. Shop around.... try to get better prices than listed.... you can!
I have only had on other experience with NR headphones, and that was with Light-speeds. The ANR was awesome. I WAS able to wear my glasses underneath them... BUT they were clamping on my head within one hour.
My advice: try as many as you can. Avoid the Bose hype. Buy Noise reduction. No matter what... buy Noise Reduction. Your ears will thank you. I've talked to people who did without NR throughout training, and they respond with "what?" after many questions.